/*
 * Copyright 2013-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 */

package cn.cloud.all.security.oauth2.client;

import cn.cloud.all.security.oauth2.client.exception.AccessTokenRequiredException;
import cn.cloud.all.security.oauth2.common.OAuth2AccessToken;
import cn.cloud.all.security.oauth2.resource.OAuth2ProtectedResourceDetails;
import org.springframework.http.client.ClientHttpRequest;
import org.springframework.util.StringUtils;

public class DefaultOAuth2RequestAuthenticator implements OAuth2RequestAuthenticator {

    @Override
    public void authenticate(OAuth2ProtectedResourceDetails resource, OAuth2ClientContext clientContext, ClientHttpRequest request) {
        OAuth2AccessToken accessToken = clientContext.getAccessToken();
        if (accessToken == null) {
            throw new AccessTokenRequiredException(resource);
        }
        String tokenType = accessToken.getTokenType();
        if (!StringUtils.hasText(tokenType)) {
            tokenType = OAuth2AccessToken.BEARER_TYPE; // we'll assume basic bearer token type if none is specified.
        } else if (tokenType.equalsIgnoreCase(OAuth2AccessToken.BEARER_TYPE)) {
            // gh-1346
            tokenType = OAuth2AccessToken.BEARER_TYPE; // Ensure we use the correct syntax for the "Bearer" authentication scheme
        }
        request.getHeaders().set("Authorization", String.format("%s %s", tokenType, accessToken.getValue()));
    }
}
